2108.1DESCRIPTION
This Work consists of providing and placing geosynthetics used for one or more of the following:
2108.2MATERIALS
Provide the type(s) of geosynthetics as shown or allowed in the Plans.
2108.3CONSTRUCTION REQUIREMENTS
A General Submit the proposed construction sequence for geosynthetics and fill placement to the Engineer for review at least 21 Calendar Days prior to beginning of this element of construction. Place geotextiles, as required in the Plan or as directed by the Engineer. Prepare a smooth surface, free of ruts, stones, sticks, or other debris or irregularities that may puncture or tear the geosynthetic or prevent intimate contact with the subsurface soil. Place the geosynthetic oriented as shown in the Plan. Secure geosynthetics so that they will not be displaced during subsequent construction. No loose or wrinkled geosynthetics are permitted. Permit no traffic or construction E quipment to operate directly on the geosynthetics. Repair any damage to the satisfaction of the Engineer by patching and/or sewing. Replace any geosynthetic that is exposed to the sun for more than seven Calendar Days. Place fill onto the geosynthetics in uniform Lifts as required by the applicable Specifications, but in no case exceed 12 inches. Use fill Material as shown in the Plan. B Geotextile If multiple pieces of geotextile are required, overlap geotextiles a minimum of 36 -inches. In lieu of overlapping, the Contractor may sew the geotextile provided there is a passing Departmental Quality Assurance sewing test prior to installation. Use a “double spool” machine capable of sewing a Federal Type 401 locking stitch per ASTM D6193-16, Standard Practice for Stitches and Seams. Sew a flat, “J,” or butterfly seam per ASTM D6193-16, using thread with a minimum strength of 25 pounds, with 1 -2 rows of stitching and 5-7 stitches per inch. Meet the required seam strength for the specified geotextile type. Install the geotextile, using the same geotextile, seamstress, thread, and sewing machine as used for the test. The Contractor may use adhesives listed on the APL, Geosynthetic products, “Adhesive Seams and Guidance” in lieu of overlapping or sewing for Types 3, 4, and 5 geotextiles. Apply adhesive per the Adhesive Seams Guidelines found on the APL. C Geogrid Overlap all geogrids a minimum of one foot or the minimum required in the Contract. Do not use fasteners, such as hog rings or zip ties, unless required in the Contract. Seams are not allowed in the high strength direction. Place Type 1 Geogrid used for Aggregate base reinforcement parallel to the centerline of the Roadway unless specified otherwise. D Concrete Pavement Geotextile Interlayer When a geotextile interlayer for concrete pavement is required, install Type 8 geotextile in accordance with 2301.3F.3, “Placement on Type 8 Non-woven Geotextile Interlayer.”
2108.4METHOD FOR MEASUREMENT
The Engineer will measure geosynthetics by area based on the actual surface dimensions installed, with no allowance for overlaps or seams.
2108.5BASIS OF PAYMENT
The Contract Unit Price for Geosynthetic Construction Materials is compensation in full for Equipment, Materials, and labor required to complete the Work and includes the cost of providing, placing, overlapping, or sewing or gluing, testing, anchoring, and any needed repairs.
The Department will pay for Geosynthetic Construction Material based on the following schedule: Item No. Item Unit
2108.504 Geotextile Fabric Type * ____ square yard
4 Geogrid Type ǁ ___ square yard
Notes: * Specify Type: 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, or 13 ǁ Specify Type: 1 or 2
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